The Grim Adventures of Billy & Mandy takes place in the fictional town of Endsville and is known for its grimmer and unhinged surreal atmosphere. The series centers around the exploits of Billy (
Richard Steven Horvitz), a dimwitted yet happy-go-lucky boy; his friend Mandy (
Grey DeLisle), a deadpan,
cynical, and cold-hearted girl; and their best-friend-by-obligation Grim (
Greg Eagles), a begrudging
Jamaican-accented
Reaper who is reluctant to serve the two children. After Billy and Mandy cheated at a
limbo match against Grim to save Billy's pet
hamster (in retaliation for putting the limbo rod too low for them to go under), he is enslaved in an unwanted permanent friendship with the children. Grim is miserable in the first days of his servitude, at times taking pleasure at the fantasy of killing them. However, he gradually adapts to the new life and even grows to care for Billy and Mandy, if only somewhat. Despite this, he desires to break free from his servitude. Billy and Mandy use Grim's supernatural abilities and powers to venture into supernatural locations or environments, such as the
Underworld, or the Netherworld, inhabited by an assortment of grotesque monstrous beasts. The duo also use Grim's enormously strong supernatural abilities or ties with a number of beastly characters to achieve goals or desires for themselves, often with twisted results. Famed fictional monsters including
Dracula, the
Wolfman and the
bogeyman are also comically depicted in the series. Supporting characters include Irwin (
Vanessa Marshall), Billy's nerdy best friend who has a crush on Mandy; Harold (
Richard Steven Horvitz), Billy's initially apathetic father who shares his son's stupidity in later episodes; Gladys (
Jennifer Hale), Billy's loving yet mentally unstable mother; Mindy (
Rachael MacFarlane), the snobby, stuck-up, and spoiled queen bee of Billy and Mandy's school; Sperg (
Greg Eagles), the local bully who has a sensitive side; Hoss Delgado (
Diedrich Bader), an overly-intense "spectral exterminator" who hunts supernatural creatures; Nergal (
David Warner/
Martin Jarvis), a friendship-seeking demon who later marries Billy's aunt and bears a son, Nergal Jr. (
Debi Derryberry); General Skarr (
Armin Shimerman), Billy's ill-tempered next door neighbor who originated in the
Evil Con Carne animated series;
Eris (
Rachael MacFarlane) the Goddess of Chaos who causes trouble for her own amusement; and Jeff (Maxwell Atoms), a giant spider constantly trying to win the approval of the
arachnophobic Billy, whom he sees as his father. The series lacks continuity for the most part, as many episodes end with characters killed, exiled, or stuck in a situation. Characters sometimes display awareness of some events from previous episodes, but there are no clear
character arcs or coherent plot lines tying the show together. == Voice cast ==